- any bivalve mollusk, especially an edible marine bivalve of the family Mytilidae and a freshwater clam of the family Unionidae.
- any of various marine bivalves of the genus Mytilus and related genera, esp M. edulis (edible mussel), having a dark slightly elongated shell and living attached to rocks, etc,
- any of various freshwater bivalves of the genera Anodonta, Unio, etc, attached to rocks, sand, etc having a flattened oval shell (a source of mother-of-pearl). The zebra mussel, Dreissena polymorpha, can be a serious nuisance in water mains
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